Alexander's band, also called Alexander's dark band, is an optical phenomenon associated with rainbows that appears as a comparatively dark region of sky between a primary and a secondary rainbow. It occurs because light deviated at the intermediate angles between the two bows cannot reach the observer's eye. The phenomenon is named for Alexander of Aphrodisias, who described it in his ancient commentary on Aristotle's Meteorology. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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Alexander's band (Wikipedia)
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Alexander's band or Alexander's dark band is an optical phenomenon associated with rainbows which was named after Alexander of Aphrodisias who first described this phenomenon in Aphrodisias, Commentary on Book IV of Aristotle's Meteorology (also known as: Commentary on Book IV of Aristotle's De Meteorologica or On Aristotle's Meteorology 4), commentary 41.
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